One related to my by my siblings...
About 15 years ago, my 2 eldest siblings were members of a church youth group.

This youth group was somewhat unorthodox, as they'd meet at about 7:30 at a couple's house, there'd be 20 minutes of 'God stuff', and then the rest of the night was theirs. A really chilled environment, it was great.

From time to time, the youth would have film nights. One night it was decided to watch a group that applied to only the youngest of the group, meaning most of the rest were incredibly bored. So a deal was cut that for the next time, the elder youths would pick a film.

They chose Candyman.

This film was watched while all the lights in the house were out, with blackout curtains drawn, meaning that the only available light came from the screen itself. This of course led to people flicking paper, making the target jump a mile when it hit them, all low grade stuff. However, the mood was tense, and everyone was quite nervous as the film reached its end.

Afterwards, everyone was chattering about how much it freaked them out, even the lads admitted to being on edge. All except one lad, Gary Grace. He was never the most popular lad, and would always try to 'buck the trend' as it were.

He said "Didn't bother me at all, not one bit." This leads to mischief in my brothers mind (sadistic bastard, it's where I got it from), and he whispers in someone's ear, before disappearing.

During this pitiful show of masculinity, someone poses a challenge. "Fine Gary, if you're not scared, you won't have any problem going into the bathroom and saying Candyman five times into the mirror."

He of course accepts this pitiful challenge, walks down to the bathroom, opens the door, turns the light on, turns to the mirror and says "Candyman, Candyman, Candyman, Candyman, Candyman", and turns to receive his praise.

He didn't get any. Everyone came to the same conclusion - "No, you've got to have no light on, and the door closed!" Gary gulps a little, and again agrees, a little nervously. So the light in the hall goes out, the light in the bathroom goes out, and the door is shut. Gary looks into the mirror, surveying the surroundings. He admits that the full wall mirror makes things much weirder, as he looks at the bath, toilet, shower cubicle and hamper behind him, so he can keep his bearings by the minute light leaking through the window.

He looks into the mirror at his reflection, and starts to recite loudly - "Candyman.CandymanCandymanCandymanCandy-AAAAAAAAA"

As he threw open the door, and ran out of the house screaming, past the very confused youth gathered outside. They nervously tiptoe into the bathroom, and hear a strange sound. It's my 6' 2" brother, lying on the floor of the bathroom, busting a lung laughing.

As soon as the boasting had started, he'd told his friend to set the challenge, and gone to hide in the shower cubicle, hidden by the curtain.

As Gary had reached the fifth 'Candyman', my brother pounced through the shower curtain, and grabbed him by the shoulders, setting off the aforementioned escape.

Gary was eventually coaxed back into the house half an hour later, but never came back again.